| 摘要 |
PURPOSE:To rotatably support a pulley without press-fitting bearings into a hole of the pulley and while preventing the pulley from slipping off and prevent the outer periphery of the pulley from being changed, by providing an inside wall of the hole of the pulley with a projection for preventing the two bearings from coming close to each other, and bringing a stopper into contact with one of the bearings on the outside with respect to the direction of a shaft to restrain the bearing from moving in the direction of the shaft. CONSTITUTION:A gear pulley 122 is provided with a hole 122d into which bearings 128, 129 are inserted, and an annular projection 122e is provided at an intermediate part of the inside wall of the hole 122d. The bearings 128, 129 are inserted into the hole 122d, and a shaft 127 is passed through holes of the bearings 128, 129. An E-ring 130 is fitted to the shaft 127 in the state of making contact with the lower end of the lower bearing 129, and the gear pulley 122 is supported on the shaft 127 through the projection 122e by the bearing 129 prevented from slipping off by the E-ring 130. As a result, it is unnecessary to press-fit the bearings 128, 129 into the hole 122d of the gear pulley 122 to fix the bearings 128, 129 and the gear pulley to each other. |
